74298821 has 4 divisors (see below), whose sum is σ = 74623500. Its totient is φ = 73974144.

The previous prime is 74298811. The next prime is 74298827. The reversal of 74298821 is 12889247.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38130625 + 36168196 = 6175^2 + 6014^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74298821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74298827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161996 + ... + 162453.

It is an arithmetic number, because the mean of its divisors is an integer number (18655875).

Almost surely, 2^74298821 is an apocalyptic number.

It is an amenable number.

74298821 is a deficient number, since it is larger than the sum of its proper divisors (324679).

74298821 is a wasteful number, since it uses less digits than its factorization.

74298821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324678.

The product of its digits is 64512, while the sum is 41.

The square root of 74298821 is about 8619.6763860368. The cubic root of 74298821 is about 420.3979995246.

The spelling of 74298821 in words is "seventy-four million, two hundred ninety-eight thousand, eight hundred twenty-one".